1. Sound Waves & Hearing How do we Hear Sounds??

2. Essential Standard 6.P.1Understand the properties of waves and the wavelike property of energy in earthquakes, light and sound waves.

3. Clarifying Objective 6.P.1.3Explain the relationship among the rate of vibration, the medium through which vibrations travel, sound and hearing.

4. Essential Questions How does sound travel through the mediums of solids, liquids, & gasses? How is the human ear designed to receive sound waves? How do vocal chords work to produce sound?

5. EOG Questions What is the relationship between the speed of sound and the medium through which it passes? If a guitar player adds thicker strings how will it effect the vibrations of the strings?

6. Waves Waves are a disturbance or vibration a way of transferring ENERGY from one place to another They transport ENERGY from on place to another There are different categories & types of waves They all have their own characteristics that make them waves

7. What is Sound Sound is vibrations of energy that travel through a medium and can be heard and processed by human or animal ears Vibrations Travel through a medium – Solid – Liquid – Gas Heard and processed by humans or animals http://www.youtube.com/watch? v=czr7122MBOY http://www.youtube.com/watch? v=czr7122MBOY

8. Mechanical Waves Mechanical Waves are waves that require a solid, liquid or gas to move through ①Transversal Waves ②Longitudal Waves

9. Longitudinal Waves Longitudinal Waves are like pinball waves. These waves vibrate in the direction of the flow of energy An example is a pinball machine http://www.youtube.com/w atch?v=yd-G6KYwzvA http://www.youtube.com/w atch?v=yd-G6KYwzvA 2:48-3:47

10. How is Sound Created ①Sound Starts when an object is vibrated The vibrations send out energy in a Longitudinal wave through a medium The energy travels through either liquids, solids, or gases

11. Traveling through Mediums Sound waves are mechanical waves meaning they must travel through a medium (unlike Electromagnetic Waves) Solid Liquid Gas

12. Traveling Sound Sound travels fastest through solids It travels at a medium speed through liquids Sound travels slowest through gases http://www.youtube.com/w atch?v=_pcsOG-H3Ac http://www.youtube.com/w atch?v=_pcsOG-H3Ac 2:53-3:40

13. Essential Questions Get with a partner and answer… How does sound travel through the mediums of solids, liquids, & gasses?

14. Particles Vibrating ②Next particles (atoms) crash into each other sending a chain reactions to the next particle & so on http://www.youtube.co m/watch?v=ACeUO4ufx 2I http://www.youtube.co m/watch?v=ACeUO4ufx 2I

15. Atoms/Energy Hits the Ear ③The particles of atoms/energy crash into each other until they hit the human ear ④The outer ear catches these atoms/energy and helps us determine…  Direction  Frequency

16. Hitting the Ear Drum The sound waves then travel down the ear canal and hit the ear drum The ear drum begins to vibrate from the repeated atoms/energy hitting it

17. Milieus The vibrating ear drum then hits the first of three very small bones in the inner ear (smallest bones in the body) This bone is called the Milieus which is attached to the ear drum It is attached to the next bone and sends the vibration through

19. Incus The vibration then hits the Incus The Incus is the middle bone in the inner ear The Incus transfers the vibration of energy to the last of the 3 inner ear bones

20. Stapes The sound vibration is then sent to the last of the inner ear bones called the Stapes The Stapes hits the side/wall of the cochlea and sends sound waves

21. Cochlea Inside the Cochlea there are about 20,000-30,000 little fibers that are kind of like blades of grass These fibers are set to only recognize certain frequencies When the specific frequency hits the specific fiber it sends a signal to tiny hair cells

22. Cochlea The tiny hair cells take the specific frequency to the Cochlear nerve The Cochlear nerve then sends that frequency to the brain The Brain identifies the sound and puts a name to the sound

23. How we Hear http://www.youtube.co m/watch?v=_pcsOG- H3Ac http://www.youtube.co m/watch?v=_pcsOG- H3Ac 8:32-9:00 http://www.youtube.co m/watch?v=qgdqp- oPb1Q http://www.youtube.co m/watch?v=qgdqp- oPb1Q

24. Essential Questions Get with a partner and answer… How is the human ear designed to receive sound waves?